64655679217 has 8 divisors (see below), whose sum is σ = 65097340200. Its totient is φ = 64214121600.

The previous prime is 64655679211. The next prime is 64655679259. The reversal of 64655679217 is 71297655646.

It can be written as a sum of positive squares in 4 ways, for example, as 4238530816 + 60417148401 = 65104^2 + 245799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64655679217 - 2⁷ = 64655679089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64655679211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559083 + ... + 1600015.

It is an arithmetic number, because the mean of its divisors is an integer number (8137167525).

Almost surely, 2^64655679217 is an apocalyptic number.

It is an amenable number.

64655679217 is a deficient number, since it is larger than the sum of its proper divisors (441660983).

64655679217 is a wasteful number, since it uses less digits than its factorization.

64655679217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51683.

The product of its digits is 19051200, while the sum is 58.

The spelling of 64655679217 in words is "sixty-four billion, six hundred fifty-five million, six hundred seventy-nine thousand, two hundred seventeen".